I spray painted my JBL Flip 4 fabric casing and it turned out pretty good : r/JBL
Amazon.com: Case for JBL Flip 5/for Flip 6 Waterproof Portable Bluetooth Speaker, Travel Storage Bag Fits for JBLflip 4, USB Cable and Adapter Not Included - Black : Electronics
Amazon.com: MIATONE Outdoor Waterproof Portable Bluetooth Speaker Wireless - Green : Electronics